Method of making tire-casings.



- W. R. DENMAN.

METHOD 0F MAKING TIRE CASINGS. APPUcATxoN PuiMun/29.1915.

. 5 Patented Feb. 15, 1916.

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METHOD 0F MAKING TIRE CASINGS.

APPLICATION FILED IuLYzs. 1915.

101%,1 l5. PIIIQIIIQII Feb. 15,1916.

3 SHEETS-SHEET 2V.

W. R. DENMAN.

l METHOD or MAKING TIRE cAsmns.

APPLlCTiON FILED )ULY 29. 1915. 1,172,1 l, amexd Fab. i5, 19H3.

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WALTER. R. DENMAN, OF AKRGN, OHIO, ASSIGNOR TO MILLER RUBBER COMFANY, A

' CORPORATION OF OHIO.

Application filed July 29, 191 5.

To all cli/wm it may conf-ern Be' it known that I, .WALTER R. DENMAN, citizen ot' the United States, residing at Akron, in the county of Summit and State of Ohio, have invented certain new and useful Improvements in Methods of Making Tire-Casings, ot which the following 1s a specification. v

The present invention relates to improvements in the manufacture of pneumatic tire slices and pertains more particularly to certain novel steps in the method of constructing a cord carcass for same.

The invention relates particularly tothe building ot' a cord carcass for a` pneumatic vtire slice and is an improvement 1n the method described and covered by the copending application of Richard Gritlith, filed October 10, 1914, Serial Number 866,133.

The present invention has for its principal object to provide .an improved method ot' constructing a cord carcass for pneumatic tires whereby the winding, building and vulcanizing can all be accomplished without removing the tire shoe from the original winding core.

A further object of the invention consists in so constructing the tire shoearound the cord carcass that the bead material, which forms the foundation for the elencher rim of the tire shoe can be easily and eilicaciously applied in a semi-cured state before the tire casing is subjected to the. vulcanizing process, and hence will receive all the benefits to be derived by the vulcanizing step.

A still further object of the invention consists in providing aV method of constructing `a cord carcass in such manner as to subject the cords to the proper degree of tensionduring-the winding and consequently obviate the necessity of internal pressure, now used in vulcanizing the tire, to provide the necessary amountof tension of the tire casing.

It is the purpose of this application to illustrate and describe the invention according to one method, by way of example; but the method may be-modiled in various ways without-departing from the spirit of the invention. for instance the cord carcass might be removed from the winding core and placed on a separate core, upon which the completing ot the tire casing may be ac- Specicaton of Letters Patent.

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Serial No. 42,619.

complished and the vulcanization of the whole ctlected. Y

llvith these and other objects in view, the invention consists in the combination and arrangement of parts more fully described in the accompanying specification, illustrated in the accompanying' drawings andl pointed out in the appended claims.

ln the drawings: VlFigure l is an enlarged transverse section showing the iirst step, with the cord carcass wound on the ring core. Fig. 2 is a similar view showingr entire casing ready for vulcanization. Fig. 3 is a plan view of the ringr core and detachable supporting ring secured thereto with the side rings removed.- Fig. a is an enlarged transverse sectional view of a modified form of a combined building ring core. Fig. 5 is a fragmentary perspective view of a iinislied tire casingconstructed according lto the present invention.

Referring now to the drawing particularly Figs. 1 and 2, a hollow, collapsible core 1 is provided upon which superimposed layers 2 and 3 of cord c are spil-ally wound,4

the angle of inclination of the cords in the upper llayer 3 being reversed to that ot' the cords of the lower layer 2. The hollow collapsible core l upon whichl the layers ot' 'cord are wound may be of any suitable form as for example similar to that described in my copending application tiled of even date herewith. Serial Number 42,618.

llhe cords are themselves composed oi" separate threads coated with a rubberized solution and twisted spirally to form the cord unit. The inner layer 2 is iirst applied to the hollow core being wrapped spit-ally, completely around the outer surface ot the core. The winding' of the layers 2 and 3 about the corel is eltected with the cords o under tension and the subsequent steps in the process of completing the tire casing` aresuch that this tension will be maintained throughout. After the inner layer 2 has been completely wound about the core l, a

sheet of tin foil .T is laid upon the outer surface of the cords o at the inner periphery ofthe tube thus built. The second outer layer 3 is then wound upon the layer 2 with the cords disposed at a reverse angle to the circumferential surface of the core. Sitter the two layers i2 and 3 have been completely wrapped upon the core l. under tension and in superposed relation to each other, the cords of the layers are sllt on the lines a-a, fte-a. a-a, along the inner perlphery.

-The ends of the cord layers 2 and 3 can then be separated slightly at each side of the opening, since the'tiii foil T prevents their adhering to one another, and the bead cores 4 of Asemi-cured hard rubber can be interposed between these open ends. The tin foil T isall removed after the layer-s2 and 3 have been cut open. The core 1 is then re- A cesses 7. Before the ringis applied to the core v1 the recess 7 can be suitably. lled by.

caps,so as to lpresent a smooth, unbroken, exterior surfacefor the winding operation. The outer tread and side parts of the tire casing are then built-and side rings 9 ap plied `as shown in Fig. 2 andthe whole.

wrapped with cloth 10 and vulcanized. The side plates 9'are rings made each in a single piece and of cross section shown in Fig. 2. By carefully referring to Fig. 2 it will be seen that the outer surface of the ring conforms to the contour of the inner surface of the core 1, tapering outwardly with their edges 5d on either side withinthe tii'e casing. The inner and upper'edges of the. side rings 9 Aai'e also curved and tapering upward to 'provide the side extensions 9 on either side at the outerside ot' the tire casing.

It will thus be seen that as the cloth 10 is wrapped about' the entire structure there is aV wedging action exerted on the lower bead edges of the .tire casing by the ends 5d and inner surfaces of the side rings 9, tending to maintain an even tension on the sides of the tire casing throughout the vulcanizaition. Thus while the entire shoe or casing is being vulcanized there is a maintained pressure which subjects the cord carcass to a constant tciisio'ii accomplishing a result which isfrequentlv obtained bv nieans ofan internal pressure iiuid in lotlieriiiethod's.

A\ tire .shoe may be constructed acroidingi to the steps hereinbefore described vby using a combined building ring core such as the one shown in Fig. 4 and designated by the reference 11. When such a core is employed the cord carcass is removed from the around a i'ing core, slitting the carcass thus formed alo'ng its inner circumference, in-V serting bead cores at suitable points between tlie cord plies, building up the casing on the co-rd carcass, applying supporting rings `to the ring core and at the sides of the casing respectively, wrapping the Whole with cloth under tension and vulcanizing the whole while still on the ring core. l

E2. The herein described method of building a tire slice or casing consisting in wrapping a plurality of superimposed plies of flexible coated cords completely around a ring core, interposing a strip of non-adhesive material between the inner and outer plies along the inner peripheryof their circumference, slitting the cord carcass thus formed along its inner periphery, inserting bead cores on either side between the ends of the inner and outer plies, building up a tire' casing over the carcass, applying suitable former rings to the ring'core and'at the sides of. the tire casing, respectively', Wrapping the entire structure with cloth under.,

tension, and vulcanizing the Whole While still on the ring core.

A3. The herein described method of forming a tire shoe or casingl consisting in Wrapping a plurality' of superimposed plies of parallel, flexible cords spirally around a ring core at reverse angles thereto, slitting the cord carcass along its inner periphery, applying-the bead cores, building upvthe tread, and side portions of the shoe and vulcanizing the whole, while distended and While still on the winding or ring core.

In testimony whereof I afliX my signature in presence oftwo witnesses.

. VALTER R. DENMAN. Witnesses:

C. A. VVoLr, HAROLD WILSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

